Yeah it has nothing to do with the side the driver sits on. Things like proper bumpers, emissions, lighting, other safety etc. like Stefan mentioned are what count.
A Skyline would probably need at least 1 cat added to it to be legal, the bumpers are probably fine. For headlights I'm not sure what they do in Japan, but in Europe they have little lenses than shine the lights up a little on the right side (so in Japan would be left) to illuminate signs, if they shine high on the left that could be a real nuissance to other drivers.....
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